Drilling machine



r h- 9, 1929. c. E. RANDLES 1,705,499

DRILLING MACHINE Filed March 5, 1925 V 3 heets-Sheet l 3 Sheets-Sheet 2 G. E. RA'NDLES DRILLING MACHINE Filed March 5, 1925 March 19, 1929.

March 19, 1929. G. E. RANDLES DRILLING MACHINE Filed March 5, 1925 s Sheets-Sheet Patented Mar, 19, 19259.

UNETEB ETATES enoaen n. HANDLES, or cLEvnANn, on

i ear e e PANY, or CLEVELAND, GI-IIO, A cortroiaerro rg ororrro.

DRILLING Ma e-me,

7 Application filed March 5, 1925. Serial. No. 13,263.

This invention relates to drill presses and more particularly,to drill presses of the type including a C-shaped frame structure with the bedor work support and the spindle head opposed at the frame opening.

In drill pressesof this type especially deflange surface of an upper frame part which extends upwardly and forwardly over' the bed or work support; In other words, the Q-shaped' frame structure is parted on a horizontal plan 'usually located slightly above the bed or' work support. Thebolts which secure together the flange surfaces; of the' upper and lower frame partsare obviously under considerable tension, particularly during useof the drill press and any lostmotion or give at this junction point not only results in inaccurate work, but also increases the burden or duty imposed upon the spindle head structure itself and thespindle driving mechanism. For example, if" a drill spindle boring a large hole under heavy duty is thrown merelyf at a slight angle to i the vertical, sai'd spindlewi'll be cramped in said hole, with the result that the hole is improperly drilled and additional resistance to the spindle and undesirable wear. upon the spindle bearing and'other parts are pro:

duced. V

The present 1nvent1on'a1ms to. overcome the foregoing and other. disadvantages by having the spindle'head structure formed as a un1t and secured to the upper end portion of the C-shaped unitary portion of the frame along a vertical plane. This vertical plane of securement should be as near the plane of the spindle axis as is possible, and

in the specific embodiment here i'llustrated' is slightly to the rear, an arrangement enabling all practical advantagestobeob tained. The bolts securing together the flanges of the spindle head structure and the" C-shaped frame are under but, slight tension, performingpractically all their duty in shear so that thethrust of the drill spindle in performing its work is substan- 'f tially along the plane of the attached flanged faces. Very slight: leverage is brought to bear upont'he spindle. head to pry it, as it were, away from. the frame.

It has been found in practice and actual tests that a drill press icon'structed along these lines is extremely efficient and may be subjected to maximum dutywith an extremely efficient; performance as compa'red with drill presses'of'like capacity where the frame structure is divided along a horizon- 0, s ems-r so HE! eoaewmeoarmews tal frame, at right angles to the spindle axis} Further details of the invention will be apparent from the following description, drawings and claims. i

Referring to thedrawings, Fig. 1 is a side elevation of a drill press" embodying the present invention; Fig. 2i's a front elevati'on thereof; Fig. 3 isa front elevation of the upper portion of the frameon the line 33', Fig. 1; Fig. 4 is an enlarged sectional View of the spindle head structure; and Fig; .5 is a cross sectional view on theline 5-5, g .4

.The drill press illustrated in the drawings comprises a suitable base 1 provided with an upwardly extending column or standard 2' preferably formed integraltherewith, This standardis provided with an integrally formed upper, forwardly curved portion 3 terminating in an upwardly opening U- shaped portion having front, vertically disposed flangesl, as clearly shown in Fig. 3.

This U-sh'aped frame portion is, open to "re ceive the latter described spindle head struc 'ture as'will laterappear.

The standardfl of the frame is also p robed or work support fi 'which" is supported upon and given vertical movement an el-- evating screw ack 7x'op'erated bya suitable vided withsutable wa s for guiding the handle 8. The worksupport may be of any I suitable type and may be provi' dedjwith a work table 9 andwith suitable feeding devices operated by afhand wheel 10.

' bracket 11 extends rea rwardly from the rear of the standard 2 and upon this bracket is mounted a; suitable electric motor: 12 for driving the drill spindle;

The spindle headstructure may be of any suitable type, so long as'it will fit into,

the opening of the U-shaped upper frame P and is pr ride .i i 'hav rt a y disposed ge r eaeagnient' with and attachment to the flanges flijjof the frame. F

The spindle head structure here in ,l

ism for giving the drill spindle its vertical feeding motion and itsrotary work producing motion 1s largely lmmaterial, the following mechanism is here illustrated for-this purpose. V

As indicated in Fig. '5, the drill spindle 15 is providedupon opposite sides with rack .teeth 16 for co-operation with pinions 17 driven by gears 18 which in turn are driven by the hand wheel 19 at the front of the frame. Loosely splined upon the upper end portion of the spindle is a gear 20 meshing with and driven by a gear 21 mounted upon a vertically disposed shaft 22 having a bevel gear 23 secured upon its lower end portion. This bevel gear meshes with a bevel gear 24 mounted upon a horizontally disposed transmission shaft 25, said shaft being also provided with a 'slida'ble compound gear comprising gears 26, 27 and 28. The three gears of this compound gear are respectively adapted for meshing engagement with gears 29, 30 and 31 mounted upon a second horizontally disposed transmission shaft 32, said shaft being also provided with gears 33 and 34. Gears 29,83 and 34 of shaft 32 are adapted forrespective meshing engagement .withgears 35, 36 and-37 forming a compound gear which is slidably mounted upon a horizontally disposed drive shaft 38. This drive shaft is provided at one end with a bevel gear 39 meshing with a bevel gear 40 on a shaft 41 which in turn is driven through shaft of themotor 12.

It will. be noted that by the arrangement described it is possible to pro-assemble the spindle head structure, including the spindle and the speed changegears together with their immediate supporting parts, as a unit,

before assembling the whole into the C shaped frame; which arrangement permits of the well-known advantages of fitting most of the working parts on thebench.

, It will also be noted that the flange 13 lies in a plane generally midway of the unitary spindle head structure so that the weight of this structure is substantially balanced fore and aft of the flanges 4 of the frame.

Having thus described my invention,

claim gears 42 and .43 by the pinion 44 on the 1. A drill press, comprising a frame including a column portion provided at its upper endwith side walls separated by a through cavity and terminating in edgeportions presenting forwardly a pair of securing faces, and a self-contained drilling unit including a sub-frame, a spindle sleeve axially movable in one end thereof, a spindle journalled in the sleeve, a driving shaft journalled in the sub-frame for connection with a prime mover at the end of said subframe opposite said spindle, and change speed gearing for driving said spindle from said shaft, said unit being insertable into said cavity between said side walls to a position where the drill spindle is forward of the front securing faces'thereof and where the change speed gearing is between said walls and where said connection may be had rearward thereof, and the sub-frame being provided with means adapted for securement to said securing faces whenfthe unit is so positioned, whereby said unit may be assembled before being secured with said frame to complete the pressready for connection with a prime mover.

2. A drill press, comprising a frame ineluding a column portion provided at its upper end with side walls separated by a through cavity and'terminating in edge portions presenting forwardly a pair of securmg faces, anda self-contained drilling unit including a sub frame, a drill spindle and change speed mechanism supported therein,

said unit being insertable into saidcavity between said parallel walls to a position where the drill spindle is forward of the front securing faces thereof and where driving connection witha prime mover may be had rearward of said walls,the sub-frame being provided with means adapted for securement to said securing faces, when the parts are so positioned, whereby said unit may be assembled before being secured with saidframe to complete the press ready for connection with a prime mover, and the securing means ofthe sub-frame being located approximately midway of the unit so that when attached the weight of the unitis distributed on both sides of the attachment to the main frame. 1

3. A drill press, comprising a frame ineluding a column port-ion provided at its upper end with side walls separated by a through cavity and terminating in vertical edge portions presenting forwardly a pair of securing faces, and a self-contained drilling unit including a sub-frame, a spindle sleeve axlally movable in one end thereof, a spindlejournalled in the sleeve, a vertically'disposed shaft adjacent the spindle, 'a driving shaft journalled inthe frame for connection with a prime moverat the endxof the frameopposite said spindle, change speed gearing for driving said spindle from said shaft,

feed mechanism for-the sleeve voperatively' whereby said unit may be assembled before connected with the shaft, said unit being pobeing secured with said frame to complete sitioned in said cavity with said vertically the press ready for connection with'a prime disposed shaft and said gearing between said mover. sidewalls, with said spindle forward there lntestimony whereof I hereby affix my of, and with said driving shaft connectable signature. I

with a prime mover rearward of said walls, GEORGE E RANDLES- 

